What are several physical disorders witch have been associated with neurotransmitter activity?

Several physical disorders have been linked to neurotransmitter activity, including depression, anxiety disorders, and schizophrenia. For instance, imbalances in serotonin and norepinephrine levels are often associated with depression, while dopamine dysregulation is implicated in schizophrenia. Additionally, disorders like Parkinson's disease are characterized by a significant reduction in dopamine production, leading to motor symptoms. These associations highlight the crucial role neurotransmitters play in both mental and physical health.